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ZK series grades which used for making mining and oil-field dirll bits are excellent overall performance with high toughness in physical and mechanical properties,porosity could be controlled in A02B00 in microstructure.ZJ series grades which used for making cap tips and auger tips are using high temperature produced ultra-coarse tungsten carbide powder with average grain size bigger than 6 μm, anti-fatigue wear and impact of superior performance,porosity could be controlled in A02B00 in microst
